Machine for drawing sharp edges on metallic bodies.



C. FULLER.

MACHINE FOR DRAWING SHARP EDGES 0N METALLIC BODIES.

APPLICATION FILED NQV. 10. I915.

Patented Nov. 7, 1916.

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Patented Nov. 7, 1916.

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CHARLES FULLER, OF GILBERCC, ARIZCNA, ASSIGNOR 0F ONE-FOURTH 1'0 L. B. MGFREDERIGK, OF MESA, ARIZONA, AND ONE-FOURTH TO L. M. HOWELL, OF

GILBERT, ARIZONA.

Specification of Letters Patent.

Patented Nov. a, 1916.

Application filed November 10, 1915. Serial No. 60,737.

To all whom it may concern Be it known that I, GHAnLEs F LLER, a citizen of the United States, residing at Gilbert, in the county of Maricopa and State of Arizona, have invented certain new and useful Improvements in Machines for Drawing Sharp Edges on Metallic Bodies, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to machines for sharpening plow shares, cutters, disk sweeps, and like metallic bodies, and particularly to that variety of machine wherein a drawing head in the form of a roller is forced downward upon the article to be sharpened and drawn across the article.

One of the objects of my invention is the provision of a sharpening machine of the character described wherein the angular movement of the drawing head may be controlled and regulated, and a further object is to provide a machine of this character in which the shank of the drawing head or member supporting the shank is slidingly mounted upon a fulcrum intermediate its ends and mechanism is provided at the end of the shank opposite the drawing head whereby this end of the shank may be rotated, thus vproviding for an approximately circular movement or providing for a movement of the drawing head upward, forward and downward upon the object operated upon and then rearward along the object.

A further object of the invention is to provide means whereby the roller of the drawing head may be adjusted toward or from the anvil so as to suit the machine to different classes of work, and still another object is to provide an anvil having adjustable abutments or flanges at its rear end, these flanges acting to hold the work against the drawing'action of the drawing head and being adjustable to suit various classes of work.

Other objects are to improve the detailed construction of the drawing mechanism of this class, simplify the parts, and permit of easy adjustment.

My invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a side elevation of my mechanism, showing in dotted lines the manner in which the parts move; Fig. 2 is a top plan nism with the supporting rings of the disk 28 removed. Fig. 7 is a diagram showing the path of movement of the drawing head.

Referring to these drawings, 2 designates the base of the machine which may be formed in any suitable manner but as illusthese bars being held in rigidspaced relation to each other in any suitablemanner. Mounted upon the bars 3 are the upstanding supporting members 4 which are spaced from each other, and extending transversely through the upper ends of the supporting members is the bolt 5 or like member upon which is'mounted a rotatable sleeve 6 forming an anti-friction roller. Disposed in the rear of the base isa crank shaft 7 which is suitably mounted in bearings 8, this crank shaft having upon it. the crank 9 which moves in a closed path. The crank shaft is intended to be driven by power applied to the fixed pulley 10 on one end of the shaft, and at its other end the shaft carries a balance wheel 11. I do not wish to be limited to any particular means for driving the shaft 7 Disposed upon the forward end of the base 2 is an anvil comprising a plate 12, the upper face of which is inclined upward and rearward relative to the face of the base.

. Mounted upon this anvil are the upstanding shanks 15 extending into these slots and engaged by nuts 16. Theanvil itself is longitudinally adjustable upon the base, and for this purpose I have illustrated the anvil as trated is composed of'parallel spaced barsB,

being formed with the downwardly extending lug 17 which is interiorly screw threaded. An adjusting screw 18-passes through the interiorly screw threaded lug, the forward end .with an annular portion 21 which, when the shank is in position, surrounds the bolt or pin 5. Forward of this annular portion the bar or shank is longitudinally split, as at 22, and passing through the shank at right angles to this split is a bolt 23. Passing through the forward end of the shank is a screw threaded post 24 which is bifurcated in its lower end and supports a drawing roller 25. This drawing roller constitutes a drawing head. The post 2st is adjustable through the shank by means of nuts 26 and 27.

Preferably disposed within the annular portion 21 of the shank is a disk 28 which is diametrically slotted as at 29. The pin or bolt 5 passes through this slot and the roller 6 engages the walls of the slot. This disk 28 is rotatably adjustable within the annular portion 21 so that the inclination of the slot 29 relative to a horizontal plane may be changed.

While I do not wish to limit myself to any particular means for holding the disk 28 in its rotatably adjusted position, I have illustratedfor this purpose the inner edge face 30 of the annulus as being smooth and the periphery of the disk as being formed with gear teeth 31 to engage with a worm 32 carried upon a shaft 33. It .will be obvious now that by rotating this worm, the lisk 28 may be rotated so as to angularly adjust the slot in any desired position. I have illustrated the disk 28 as being held in position by means of oppositely disposed holding rings 34 which are held to the annulus 21 in any suitable manner and which extend on each side of the disk. When it is desired to remove the disk 28 one of these members 3 1 is removed and then the annulus allowed to expand by loosening the bolt 23 and nuts 26 and 27 until it has expanded so far as to permit the lateral removal of the disk 28. I do not wish to limit myself to this construction however. The disk 28 and the annular portion 21 constitute together a slotted yoke through which the fulcrum pin 5 and its antifriction roller pass, this fulcrum pin and its anti-friction roller constituting a guide for controlling the movement of the shank. The shank therefore has sliding oscillatable engagement with the fulcrum pin or bolt. At its rear end the shank 20 is formed with a bearing opening through which the wrist pin of the crank shaft 7 passes.

The operation of my invention will be obvious to those skilled in the art. he article to be sharpened is placed upon the anvil 14, the draw head being in a raised position. The shaft 7 is then caused to rotate in the direction of the arrow, Fig. 1, which will shift the bar or shank 20 forward until the fulcrum pin has reached the end of the slot 29. The wrist pin of the crank will then commence to rise and this will act to tip the shank and then as the wrist pin moves rearward and rises, the forward or head end of the shank will be depressed and at the same time drawn rearward. By shifting the angle of the slot 29 and by altering the position of the draw head formed by the roller 25, the draw head may be adapted for various classes of work. By adjusting the draw head vertically with relation to the shank or bar the -machine may be adapted for either light or heavy work. By providing the machine with the slotted yoke it is adapted for operating upon beveled edges and by adjusting the angle of the disk 28 the movement of the draw head or roller may be changed to suit any desired work. The purpose of the guard flanges or abu ments 13 of the anvil is to engage the rear edge of the work and prevent the work from being drawn rearward by the motion of the draw head. Thus the action of the draw head will be uniform thus insuring a smooth edge with no waste of material. The anvil may be adjusted longitudinally along the main frame so as to give the draw head a wider or narrower working range. as dcsired.

' In Fig. 7 I have shown the path of travel of the drawing head. It will be seen that this is a closed or cyclic path, that the path taken by a body which moves at all times in the same direction around a point which is more or less the center of motion of the body, the body passing con-- tinually and successively through the same points. It will be seen from this figure and from Fig. 3 that the drawing head moves rearward in a plane at a slight angle to the horizontal, as at a, that then the draw head rises and simultaneously moves forward on the line Z), then moves downward and forward slightly as at a, and then moves downward and rearward as at (l. tention is called to this movement of the draw head as by this movement I secure a drawing action of the head which is not present where the head is simply oscillated or reciprocated. In my case the draw head clears the work upon the return movement and rolls and presses the work all in one direction. The work is operated upon by a Particular at- V the shank opposite the head, and means series of strokes made all in the same direction and not by a series of strokes made in alternate reverse directions.

Having thus described the invention,

what is claimed is: f 1. In a mechanism of the character described, the combination with an anvil, of a bar having a drawing head at one end, a fixed fulcrum, means for pivotally and slidably supporting the bar intermediate its ends upon said fulcrum, and means for rotating that end of the bar opposite to the head.

2. In a mechanism of the character de scribed, the combination with an anvil, of a bar or shank having a drawing head at one end, a fixed fulcrum, means for pivotally and slidably supporting the bar or shank on said fulcrum, and means for longitudinally shifting and oscillating the bar.

3. In a mechanism of the character described, an anvil, a bar or shank having a.

that end of the bar or shank opposite the head in a plane at right angles to the ful- 4. In a mechanism of the character described, a base, an anvil supported thereon, supports extending upward from the base, a fulcrum member on said supports, a bar or shank having a drawing head at one end, the bar or shank intermediate its ends being formed with a longitudinally slotted yoke through which the fulcrum pin passes, and a power operated crank mounted upon the base and operatively engaging the end of the shank opposite the head.

5. In a mechanism of the character described, a base, an anvil supported thereon, supports extending upward from the base, a fulcrum member on said supports, a bar or shank having a drawing head at one end, the bar or shank intermediate its ends being formed with a longitudinally slotted yoke through which the fulcrum pin passes, a power operated crank mounted upon the base and operatively engaging the end of whereby the angle of the slot in said yoke my be changed.

6. In a mechanism of the character described, the combination with an anvil, of a bar or shank having a drawing head at one Copies of this patent may be obtained for means for rotating the end of said bar opposite the drawing head in a plane at right angles to the fulcrum, said disk being r0- tatably adjustable within the annulus.

7. In a mechanism of the character described, the combination with an anvil, of a bar or shank having a drawing head at one end, a rotatably. adjustable member carried upon the shank intermediate its ends and diametrically slotted, a fulcrum passing through the slot, and means for giving a rotation to the end of the shank or bar opposite the drawing head in a plane at right angles to the fulcrum.

8. In a mechanism of the character described, the combination with an anvil, of a bar or shank having a drawing head at one end, the intermediate portion of the bar or shank being formed with an annulus, a disk rotatably mounted in said annulus and diametrically slotted, the disk being formed upon its periphery with teeth, a worm operatively supported upon the annulus and engaging said teeth whereby the disk may be rotatably adjusted, a supporting member including a fulcrum passing through the slot of the disk and on which said disk rocks and slides, and means for rotating the end of the bar or shank opposite the drawing head in a plane at right angles to the fulcrum, said disk being rotatably adjustable within the annulus.

9. In a mechanism of the character described, an anvil, a bar or shank having a drawing head at one end, a guiding member with which the bar or shank has sliding pivotal engagement, and means for longitudinally shifting and oscillating the bar. 10. In a mechanism of the character described, an anvil, a bar or shank having a drawing head at one end, a guiding member with which the bar or shank has sliding pivotal engagement, and means for moving the rear end of the bar or shank in a closed path in a vertical plane.

11. In a machine of the character described, an anvil, a bar or shank having a drawing head at one end, a guiding member with which the bar or shank has sliding pivotal engagement, and means for moving the rear end of the bar in a closed path in a vertical plane, said guiding member being disposed in a plane above the highest point of movement of the rear end of the bar or shank.

In testimony whereof]: hereunto aflix my signature in the presence of two witnesses.

CHARLES FULLER.

Witnesses:

F. E. SPIND E, C. A. MCFREDERICK.

five cents each, by addressing the,0ommissioner of Patents,

Washington, D. G. V 

